不同增韧剂协同增韧PBT

发布时间：2018-02-13 02:46

本文关键词： 聚对苯二甲酸丁二醇酯熔融接枝增韧协同增韧　出处：《长春工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：通过熔融接枝的方法制备了POE-g-GMA、POE-g-(GMA-co-St)两种接枝物,将纯POE和两种接枝物分别与PBT进行熔融共混,考察了三种弹性体对聚对苯二甲酸丁二醇酯(PBT)的力学行性能的影响,结果表明,在相同情况下,单组分接枝物对PBT的增韧效果不明显,双组分接枝物的增韧效果最好,大大改善了PBT的性能,增韧后共混物的冲击强度是前两种改性物增韧效果的十倍左右。三种不同改性剂对共混物的弹性模量和屈服强度影响不大。弯曲强度随着GMA、St的引入在一定程度上有所降低。总的来说,GMA、St的引入对PBT的增韧起到积极作用。通过熔融接枝法合成了不同GMA含量的POE-g-(GMA-co-St),考察了不同接枝率的改性POE对于增韧PBT的影响。结果表明,GMA的用量对共混物的力学性能有影响,但影响不大。综合各项性能可以看出,GMA含量为1%时共混物的增韧效果最佳,随着改性剂的不断加入,共混物的冲击性能得以提高,弹性体用量在10%~15%之间即完成脆韧转变,继续增加弹性体用量,冲击性能继续增强,但逐渐趋于平缓。共混物的拉伸性能和弯曲性能均随着弹性体用量的增加逐渐降低,但GMA含量对共混物的拉伸性能和弯曲性能影响不大。选用不同牌号的POE弹性体,并对其进行官能化,官能化所用GMA含量相同,探究POE的物理性能对增韧效果的影响。结果表明,不同牌号的POE对PBT的增韧效果不同,说明POE的物理性能对PBT的增韧效果有影响。探究两种弹性体协同增韧PBT的效果。将POE分别与EPDM、LDPE、LLDPE按不同比例混合,将混合好的弹性体分别与PBT进行共混,保证改性剂所占份数相同。考察了EPDM、LDPE和LLDPE的引入对共混物力学性能的影响。结果表明,在增韧PBT时,官能化的纯POE对共混物的增韧效果最佳,LDPE和LLDPE的引入,显著降低了PBT/POE共混物的力学性能。引入量的多少,对共混物的性能影响不大。
[Abstract]:Two kinds of POE-g-GMA-co-St-POE-g-GMA-POE-g-GMA-co-St. were prepared by melt grafting method. The pure POE and the two grafted polymers were fused blended with PBT respectively. The effects of three elastomers on the mechanical properties of poly (butylene terephthalate) (PBT) were investigated. Under the same conditions, the toughening effect of mono-component grafted polymer on PBT is not obvious, and the toughening effect of two-component grafted polymer is the best, which greatly improves the properties of PBT. The impact strength of the toughened blends was about ten times that of the first two modifiers. The three modifiers had little effect on the elastic modulus and yield strength of the blends. The flexural strength of the blends increased with the introduction of GMA-St to a certain extent. In general, the introduction of GMA St played a positive role in the toughening of PBT. POE-g-GMA-co-Stan with different content of GMA was synthesized by melt grafting method. The effect of modified POE with different grafted ratio on toughening PBT was investigated. The quantity has an effect on the mechanical properties of the blend, But the effect was not significant. The toughening effect of the blends was the best when the content of GMA was 1. With the addition of modifier, the impact properties of the blends were improved, and the brittleness and toughness transition was completed when the content of the elastomer was between 10% and 15%. With the increase of the amount of elastomer, the impact properties of the blends continued to increase, but gradually tended to smooth. The tensile properties and bending properties of the blends decreased with the increase of the content of elastomer. However, the content of GMA has little effect on the tensile and flexural properties of the blends. POE elastomers of different grades are selected and functionalized. The content of GMA used in functionalization is the same. The effect of the physical properties of POE on the toughening effect is investigated. Different grades of POE have different toughening effects on PBT, indicating that the physical properties of POE have an effect on the toughening effect of PBT. The mixed elastomer was blended with PBT to ensure that the content of modifier was the same. The effect of the introduction of LLDPE and LLDPE on the mechanical properties of the blend was investigated. The results showed that the blends were toughened with PBT. The toughening effect of functionalized pure POE blends was the best. The introduction of LDPE and LLDPE significantly reduced the mechanical properties of PBT/POE blends, but the addition amount had little effect on the properties of the blends.
【学位授予单位】：长春工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O633.14

【相似文献】